Soil remediation at contaminated sites very often needs customized approach, because of the different content of pollutants. Various technologies from simple soil excavation and transporting to hazardous waste landfills to different kinds of remediation by vitrification and the use of additives can be used for the treatment of soil. A series of remediation experiments using zeolites and humic acids were applied to soil contaminated with copper. Remediation can be performed with easily available additive materials of natural origin found near the place of application, in order to diminish the leaching of contaminants. Soils contaminated and spiked with copper were mixed with additives, and ion selective electrode potentiometry was used in order to establish the stability constants of humic-metal complexes. Thus the study provides an opportunity to gain information on the fate of copper variously mixed with potential remediation agents -zeolites and humic acids -as additives to contaminated soils.
Abstract. Contamination with lead in soil is a crucial problem in industrial and military sites. Immobilization of lead by natural and modified clay as soil amendment can be an effective solution to this problem. Quaternary and Devonian clays were chosen for modification with NaCl, CaCl 2 , FeOOH and Ca 10 (PO 4 ) 6 (OH) 2 in different proportions of Ca/P equimolar ratio to test and compare immobilization efficiency of lead (II) on raw and modified clays by using a batch leaching test. The aim of the study is to compare different types of raw and modified clays as soil amendments by lead immobilization properties.
Different solutions for groundwater treatment often are needed because of complicated hydrogeological conditions and manifold contaminants demanding distinct approaches for remediation. Various technologies of treatment can be used such as pump-and-treat, reactive barriers, chemical injections and other. Two systems were proposed for treatment of different age and fraction oil product contamination in groundwater of the Baltic Sea coastal area north from Ventspils City, in the western part of Latvia. Remediation should be performed after careful analysis of results of groundwater level and LNAPL fluctuations in the zone of direct influence of the open sea. Series of experiments using vacuum pumping system were performed in addition to the monitoring as one of the method for estimation of the close-to-sea hydrogeological conditions. Groundwater contamination, LNAPL monitoring and intensive pumping of contaminated groundwater is in progress during season 2012. Contaminated groundwater flow behavior is under the strong influence of the sea, therefore common methodology by creating artificial groundwater surface depression by vacuum pumping can be questionable and not very effective. This study gives the opportunity to evaluate efficiency of vacuum pumping treatment system for two different types of oil contamination under the strong marine influence conditions.
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